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(10 1/7-у) : 1 1/7+2 5/8=7 1/8

(10 1/7 - y) : 1 1/7 + 2 5/8 = 7 1/8

(10 1/7 - y) : 1 1/7 = 7 1/8 - 2 5/8

(10 1/7 - y) : 1 1/7 = 6 9/8 - 2 5/8

(10 1/7 - y) : 1 1/7 = 4 4/8

10 1/7 - y = 4 1/2 * 1 1/7

10 1/7 - y = 9/2 * 8/7

10 1/7 - y = 9/2 * 4/7

10 1/7 - y = 36/7

10 1/7 - y = 5 1/7

y = 10 1/7 - 5 1/7

y = 5

(71/7-у) * 7/8+21/8=57/8

71/8-7/8 * у + 21/8=57/8

-7/8*у=57/8-71/8-21/8

-7/8*у=-35/8

у = (35/8) / (7/8) = (35/8) * (8/7) = 5